SXM Website Updated, EHAS still required. Booster required after 1 year among other info:

ANNOUNCEMENT

As of November 1, 2021 all travelers to Sint Maarten who are fully vaccinated will be exempted from a COVID-19 test. The completed vaccination date cannot be older than one year, unless a booster shot has been administered before the ending of the year. The EHAS application must still be completed. The date of completion of vaccination must be submitted as well as valid proof of vaccination from the country where the vaccine was administered. A received booster shot must be indicated in the appropriate field and proof thereof must be uploaded as well.

You are considered fully vaccinated with an accepted vaccine:

2 weeks after the second dose in a 2-dose series, such as the Pfizer, Moderna, Astrazeneca, Sinopharm, Sinovac/Coronavac and Covishield vaccines, or
2 weeks after a single-dose vaccine, such as Johnson & Johnson/Janssen vaccine, or
2 weeks after the second dose in a 2-dose series combination of a single dose Pfizer or Moderna with a single dose Astra Zeneca, or
2 weeks after a single-dose of vaccine after a confirmed COVID-19 infection (to be stated on proof of vaccination in absence of a digital COVID-19 vaccination certificate).
the accepted Covid-19 vaccines are: Comirnaty (Pfizer), Spikevax (Moderna), Vaxzevria (Astrazeneca), Johnson & Johnson/Janssen, Covishield (Astrazeneca), Sinopharm and Sinovac/CoronaVac.
All other safety and hygiene protocols like social distancing, face mask use and hand sanitizing remain in place.

As of November 1, 2021 all children 5 year of age or older are required to have a negative Covid-19 test in accordance with the required type of test for the risk status of the country of origin. For the age category of 5 up to 10 years, an oropharyngeal swab will also be accepted.